digestive system - lecture notes - tiu

Zhikal O. Khudhur/Assist lecturer_____________________________________________Systematic physiology – 2nd Stage /2nd Semester

zhikal.omer@tiu.edu.iq https://tiu.edu.iq/

2020 - 2021

TIU - Faculty of ScienceMedical Analysis Department

Digestive system

1. What are the functions of digestive system system?

2. What are components of digestive system?

3. What are the functions of saliva?

Overview of the Digestive System

The Digestive System Consists of ;

a) Long hollow muscular tube or canal or tract called gastrointestinal tract or (GIT): it is about 5 meters long

b) Accessory glands: include:• Salivary glands

• Liver and gall bladder

• Pancreas

Overview of the Digestive Tract

GIT consists of;• Oral cavity or mouth

• Pharynx

• Esophagus

• Stomach

• Small intestine

• Large intestine

• Rectum

• Anus

Components of Digestive System and Their Functions

Main Functions of Digestive System

• 4 major activities of GI tract1. Motility

• Propel ingested food from mouth toward rectum

2. Secretion of juices e.g. saliva • Aid in digestion and absorption

3. Digestion• Food broken down into absorbable molecules

4. Absorption• Nutrients, electrolytes, and water are absorbed or transported from

lumen of GIT to blood stream